Essential Chemistry for IGCSE - Making And Identifying Salts (Section 2 - No. 33)
What is the test for Sulfur Dioxide gas?
Add a few drops of sodium hydroxide.
Add a few drops of acidified potassium manganate(VII).
Add a few drops of silver nitrate.
Use a flame test.
Explanation
Acidified potassium manganate(VII) changes color in the presence of sulfur dioxide.
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